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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '493b7a9b826759dbce4050ec1808ee074d7b770c725034b3866dc33a458fc62d' 
  AND token = '/UH0qdqM+Ar5LYgJJRt/m1i5R3Wd6cW7FRzmK0SFnfI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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