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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c5979d7e08710444705732354401b9a2de2ad6e9bf25b548380c778f6acf0ec' 
  AND token = '4iIV5GwYdrcj3DTzU0DUJlxH+YIfYL/Wp7EksrYOQlk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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