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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d97f6c099179bb080f78d99b260e90bb217ddea9532ab23461504e5c19a603b' 
  AND token = '8Rb1yVOgUlFaaHqm0IdNG3OXVne7sl3l1xWV8fe8LvY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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