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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa1af8cda57c8df9f0ab76d93c9bb324f109e8015cdeff2111e7c63a6625ed4b' 
  AND token = '5AtM0uDQQXNPacodDk9db7diI3VK7KAxM1DskVUZH48=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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