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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfbcf3829713bf2bf826ddbba9e8f3f519a2bb071c3114749d0ec05fff39f9c9' 
  AND token = 'MYlETlmajJhfY219sUyo5RL0hb+eaLXJqzlYNK4GSjs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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