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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '939ac3cba8fa631adcda7339f9a341cf4bc37d42b59324722b1aa89f1f3b1b94' 
  AND token = 'VBY1uJelyrk8QzWv6Xeu8FX3S4nGask0LhnpjmlBEsA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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