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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce97eea05dfae3f0b3ff229882dc9efb971ee384497b7fb3a16786c1c213f918' 
  AND token = 'xhO4xFTYCFZMt9t3awsZMH1IEAHa2sbm1P/+87KBHZk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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