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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f113823972259305c7d04b9cef61da066701183e71b21dbfe5ef6703021248ae' 
  AND token = 'DpO4tF0QKu14XZ6/WLaDAPJgW2U2HiJdOLQ3JWik+Gc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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