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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0f592b938896421a404ee4891def208e8bb1b2cd77495c726f314732737b742' 
  AND token = 'ATgW6AuITqDTpMBhXVccPfiV2r6diSA5PqbveR9eJs4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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