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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf827123f8b734b787e1c34a1fdaac31d0dfa4309cfa98ae673b5fbce7abe20e' 
  AND token = 'OBIlP/Tg7AduAb1Of33bSVPqdBlzMKjYzCeRN0B5qD4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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