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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b4b185424e461183f34a60db4b5a4ac11da5d40bc0cf440d86c5af7000538da' 
  AND token = 'QBE3N/5LaPCFL40AWdD2Ev3CBr2Z2a2kycfIPNQe4Pc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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