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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85ed9d6e27f8a4e6e435a8e4cded03898cbac7cc90aa38b9abd90dee87ee8827' 
  AND token = '1YgmhqZRiUzO5Orsedt/GrV7Or9XhCvQBZahns8/kSg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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