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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a341a371a518330b6a1efa838c113d3bd60e3f128531da7c56396e3ef9f196bf' 
  AND token = 'moDFZYfIJSv5CNi0+oproBwGm5pFGcs5M6mKluF32ps=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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