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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad18e4d650d15efe730eacd780e403aab4207a0b6b928562af250e6f0c5d4747' 
  AND token = 'ATfHpZqbMLXCS/3GMfGT9pVAid1ze/Udnlq83AN9mjY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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