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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dda9f6b1500ef9a7034cf04009b3cf8e7c1cf7b408c4fe6825044e9f4205e5b6' 
  AND token = '+8lDjqVsUC/VpmXrl38NCQRpY8q81jtAIsOXc5T6aPM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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