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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3154da6697b6c9ae0201f1e9cadad9598e06dfbc177636e8928623425c85ed9' 
  AND token = 'tBVluqRDoERCtfpFqLan/LT9vO0iRbWyYPFvYeeBYcU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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