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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5434b534ea3c7282709160d4895cc2033a2807727928b0b0c2e572abe5a879cb' 
  AND token = '7o4+202r0uT+dOSZZB7F4hT3LLPaZcU8TLmTWdCthos=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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