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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dce311032de7c05c29abe21f3035f0642cccc2e727fdca5f3629fdc744682ad6' 
  AND token = 'MKz+ZEKu1eTP1HJ1e3/sFXoaehHIdHmNWGaXfN0IrLs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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