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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd247abdd97a8c3e861898df6b11735b0852d09eb0cec513d6c66b0320e457da' 
  AND token = '3jifyxGPe5fWkJVeZUiqwklDEaRxpXIMN5Gvjyr1ofA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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