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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95a1d8938cda1f8db838783581b524044214495cf2d6f7203a737be12174e3f3' 
  AND token = 'grAahEa0XiNv4Qlcm4O/Iwee9+sPSg05Bz0d1D084x0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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