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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a30be7190942985562828991daa7033c85d02f5eaae3c4027e874acacb520712' 
  AND token = 'wk34Ok+Iu7BNZD8d8sN9YqTAyKOLY5n+TX1BF+hGPbY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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