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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c665023e7511aa613b70b91e70ad5f8bb145e161a882134ea54bf2ef059380f5' 
  AND token = 'Wjklqnr3VaqPUMOaVsT1+QlLpZmg67M2ubkgQB15ePA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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