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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30afe8474b9d7347c0653a58575ae1757f03042f9190ac7e2722123e1c294e76' 
  AND token = 'Cpum20c0Go9ZFhyEKjB8DZkt7+x/3nMp9z2x3nl6ORE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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