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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff44c9fa52a050e85d69b466d0a17ac20ac91e50a09a649ab727ff6a18aedb38' 
  AND token = '7WFSaWJfy+qOds3u5HiI4Gep8rUzo5nWhlthiswElOU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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