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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f009dfde7dd276321f9ca7b62721225fb8bd2ae83bc6e104feb94ea3b07e6c1' 
  AND token = '8IHAgQL1ce4UpFovi4BcoGjYCff6u2Bq0ufSZGzaT/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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