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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4292c65f72f6e552cdddb0b74bb9cf0f1fc0124b47adf0a82246bb2e2402c64f' 
  AND token = 'k+jCcs88p3Fbd8dZs2bB+qWkBchvthq41DCXCUqjbcs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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