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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a66ceef04ab477970e1ce9599a0f91e71a6c52a9bef1335e5b8b781024980f13' 
  AND token = '6sGbcy7GICKmXEKVgWiMxnx8tb+e6yijHeXrQjEW2MQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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