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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f3500eeacee7f7918e633b553058ff3f72092ba975930ce7147f0ec31794de0' 
  AND token = 'NH+e/gbCHUDOnd8GVND8Ta28tXazVuzFb9AcG6t90z8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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