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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '709fb4f0c2436a87feb9f2e0e086898446963ffff9e27bb2db9753864192d8fc' 
  AND token = 'PsxVne9jvRN9cbqdgt4Embv8+fcMzOVhLC+MYZLRpmk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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