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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '779778970586b242a9ab5bf4b3afc0ad9188e622f7464926d5d5e0f6d818dd3e' 
  AND token = 'mW2wyvYUh/wdvOisD5ayenNrCiHE5FwuiZxuDM5Pd2I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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