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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a3ab3747068ae2d8599b37f50952af5f8b34e6a08939be2cf66f5a3112eb306' 
  AND token = 'upUaNgv03qv6OFcfP/u4+6jraJSj2C7LArooTFG26qk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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