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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a68e42894e8f0426b9ca58509b2adc88471f7eac4828b9d10a067f57ec7d30c3' 
  AND token = 'N2XAAs5u5HK23yV4ntvclP91dQKUCqGZ8U5gq59SGps=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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