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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b2e62cc63b14a7acc6e2f9a947aa76df8ff1d472d51df80969d4e07918cc36d' 
  AND token = '07OmlfckCPeZPgYpS1oUV3DVv3nhWMxUNKUYvg77gMw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}