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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6bb24399dbcc75807fe4d822b0c4b4af905d415887f1efe6c61dbfe07d3f92d4' 
  AND token = '+ZZjNN5fIAeYBPeutO2sddk1SN7v42Z3hmiZU/cp2ZU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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