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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38feabed9d26084028bc6c071084fe8d9fda9b924f9b8e232f92f5e3b9f4f680' 
  AND token = '/uXayxHIgC9j4uB6zMePVJvKy9MR19QSVe+zQ1V9TUs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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