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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b43b4f8aaaf6cba6896c55610e2793e7e8dd56eb4b9fc4f5d30f20c4fee5434' 
  AND token = '9WXkqo5O2wikRAZmWKVvpx5As1J39d70lTGjV8u5hXc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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