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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b2f4d19f09732dbd1cdf4017c68912411a111cf313f148a4c470b710fb6e251' 
  AND token = 'AMNQpMlDR0W/jduZ9kZ5Y/3IIUj5nsJnZ/xPL2E7fHI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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