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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7eb5b5eeeba49fa809624810d60a6973d4acfb2032a9146c897e4be068e94a7e' 
  AND token = 'PxCYhtINlC73bzLaiASW+5np8AEaISu8WezCM5R+vrI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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