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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc0fa80bebab7f09084030feb519cf9f13978d2bf76e59a38a15305091d0e13c' 
  AND token = 'uSreHyI2HYZHbwsR9tDF6GWHENGH2xCHPymZk62oRuk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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