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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd874e6441aa4d128709a4abc06ce07d55ffd82347c839a40a84a86568483704' 
  AND token = '4dyJ64doAN9qSr8y2IGH4kQ/oHlimFOINHnIBAAJWrk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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