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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9ce11672d32a721dd3f71c410f8e367590e5ae9f933c52e9956744db5d3ce51' 
  AND token = 'vg2hazMMszWdATzclASXjp/beYIBpy7D+3HX8eUGXkA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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