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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd08720b9dd0c409217491bbe95c93e9711b379bb07130b3b6d02400b90d670ff' 
  AND token = 'JLhW12MSeaYe/yUQP3P+oLTgdhOrbdnYBkeB5mcVKrc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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