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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f881e89339d4862e022c81cd9e659f1b450fe8d953006fb74c0384ada680871' 
  AND token = 'pww80eYRn37P8qfJXND3XJ+DSyRwmjl3c1Y87YrloeY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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