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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db76ed6a2d66f0cf31035d90a86fbc1ec8ed0117213074a0b34232178cee7c58' 
  AND token = 'rHY26IQdt6xcbR9R/CRzJ4jDhbvfdiap04038QaRMOA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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