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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bbf225d86add1f187228013ebb446ef6f202dce4144961caacfaa6653210696' 
  AND token = 'O9n9W1s2d5lZOGrlCIJZC/cheypNl30XRxr7qpDLX58=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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