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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32fe62c46500860732dd8c5c8c8d45c071f682155e412345ccf0c79eb6831b65' 
  AND token = 'y1A71oV98c9VG9qIHV8WnZFWfgQoC1JQbZAMEQLWHsE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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