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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd497fbb237a027447cacea2aeea16e0f002b9fd7f794680cfe554a63fb38bfb7' 
  AND token = '8PoAX/WuX7chki/778TKBxFknZr+kv/EZ/Kzp7FfLuM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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