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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4cb5634996724197e19cc37abcb910441f7b6e8fee79a3441461c19f41bb8d4f' 
  AND token = 'PUttcxqboCQnfuF5AB2GzyidmFzg2E4r7RzCGgxPZhU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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