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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f24f8c45665aa50a90ccb9a27d4502284d835f09eb5d8f6a6d4f52b5d8f53a5b' 
  AND token = 'iDax6sbrIvKy2iDVC9hmQkkUyCRPV75J7nmJcopO4+I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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