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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e2055e5c07522572dd8548d776b6e77fa628f76d48f5f32c803df9c2d260400' 
  AND token = '+i1kl2sJ96gCw2lWKmqKD4J7FSbDBWjhqxNmRtvnIMI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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