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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a0f6d463eb27f0b70f383a975b360af7da7a3fffd11d64cfed9d1057f36f9ee' 
  AND token = 'w4sLknhvzQ6G/eAPUjaLmypdnzQpss7vkFAAjJSF/h8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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